Fish-tail propeller.



PATENTED MAY 5, 1908.

F. s. MERROW.

FISH TAIL PROPELLBR.

APPLICATION FILED FEB. 27, 1907- RS 20., WASHINGTON, u. c.

CJI

UNIT

FRANK vSGRIBVER MERROW, OF MEXICO, MEXICO.

FISH-TAIL PROPELLER.

- Application filed February 27, 1907.

To all whom it may concern:

Be it known that I, FRANK SCRIBN ER MER- ROW, a subject of the King of Great Britain, residing at Mexico city, Mexico, have invented a new and useful Fish-Tail Propeller, of which the following is a specification.

The principal object of the present invention is to provide a novel, simple and effective propeller having an oscillatory movement after the manner of a fishs tail.

The preferred embodiment of the invention is illustrated in the accompanying drawings, wherein Figure 1 is a front elevation of the propeller and one form of driving means therefor. Fig. 2 is aside elevation of the propeller and propeller shaft. Fig. 3 is a top plan view of the propeller. Fig. 4 is a rear elevation of the same. tional view on the line 55 of Fig. 2. Fig. 6 is a longitudinal sectional view on the line 66 of Fig. 2.

Similar reference numerals designate corresponding parts in all the figures of the drawlngs.

In the embodiment disclosed, the propeller consists of a neck 7 substantially circular in cross section, said neck carrying at its front a boss 8 having an angular shaft-receiving socket 9. Securing screws 10 are threaded through the different sides of the boss into the socket. Extending from the rear end of the neck are longitudinally disposed blades 11 that are arranged on opposite sides of the longitudinal axis of the propeller, and have their rear ends offset on op- V posite sides of a plane extending through said longitudinal axis, as will be clear by reference to Fig. 3. These blades are provided in opposite sides with longitudinally disposed transversely curved or concave channels 12, and the opposite sides are preferably convex, as shown at 13. The blades increase in width from the neck 7 to their rear ends, and the rear end of the propeller may be forked, as shown at 14, though the forked construction is not necessary, and the rear end of the propeller may have a vertical rear edge, as indicated in dotted lines at 15, or a tapered rear end, as indicated in dotted lines at 16, in Fig. 2.

The propeller is carried by a rock shaft 17, having its rear end fitted in the socket 9 and secured in place by the screws 10. The front end of this propeller shaft is provided with a pinion 18 that is in mesh with a segmental Specification of Letters Patent.

Fig. 5 is a cross sec- Patented May 5, 1908.

Serial No. 359,582.

rack 19 fulcrumed upon a suitable pivot 20. A driving shaft 21, operated by any suitable motor, is provided with a crank disk 21 carrying a crank pin 22, and a pitman 23, having one end mounted on the crank pin 22, has its other end secured to one arm 23 of a bell crank lever 24 that is journaled on the pivot 20. I The other arm 25 of this bell crank is adapted to have an adjustable connection as 26 with a portion of the segmental rack 19.

In the operation of the structure, when the propeller is at a state of rest, the blades are in a vertical position, as shown in Figs. '1, 2 and 4. If the bell crank 24 is secured to the segmental rack 19, as shown'in Fig. 1, upon the rotation of the driving shaft 21, the propeller will be oscillated, its movement, being from a vertical position in the direction of the arrow A in Fig. 1, a half revolution of the propeller being made, and a return movement to the original position being secured after each half revolutioni If it is desired to oscillate the propeller in an opposite direction, it is only necessary to change the position of the bell crank with respect to the segmental gear 19, as shown in dotted lines in Fig. 1, whereupon, upon the movement of the pro eller from a state of rest, said propeller will e oscillated in an o posite direction, or in other words, in the cirection indicated by the arrow B.

From the foregoing, it is thought that the construction, operation, and many advantages of the herein described invention, will be apparent to those skilled in the art, without further description, and it will be understood that various changes in the size, shape, proportion, and minor details of construction, may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is:

1. A fish tail propeller, comprising longitudinally disposed rigid blades having their rear ends longitudinally offset in opposite directions, said blades being transversely curved, and meansfor oscillating the propeller on its longitudinal axis.

2. A fish tail propeller, comprising blades located on opposite sides of its longitudinal axis, each of said blades tapering toward its rear end and being transversely curved, said blades furthermore when in upright relation having said tapered rear ends offset in oppochannel in one side.

- toward its rear end, said blades having their 1 site directions and on opposite sides of the 1 rear ends offset in opposite directions, said vertical plane in which the longitudinal axis of the pro eller is located.

3. A fis 1 tail propeller, comprising longitudinal blades located on opposite sides of its longitudinal axis, each of said blades tapering toward its rear end, said blades having their rear ends offset in opposite directions, said blades furthermore each having a longitudinally disposed transversely concave 4. A fish tail propeller, comprising longitudinal blades located on opposite sides of its longitudinal axis, said blades each tapering blades furthermore each having a longitudinally disposed transversely concave channel in one side,,a boss carried by the front end of the propeller and having a shaft receiving socket, and securing bolts passing through the boss into the socket.

In testimonythat I claim the foregoing as my own, I have hereto affixed my signature in the presence oftwo Witnesses.

FRANK SCRIBNER MERROW.

Witnesses:

C. G. KoFFRoTH, RoBIE D. LIBBY. 

